ChaiScript/include/chaiscript/utility/static_string.hpp

// This file is distributed under the BSD License.
// See "license.txt" for details.
// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
// Copyright 2009-2018, Jason Turner (jason@emptycrate.com)
// http://www.chaiscript.com

#ifndef CHAISCRIPT_UTILITY_STATIC_STRING_HPP_
#define CHAISCRIPT_UTILITY_STATIC_STRING_HPP_

namespace chaiscript
{
  namespace utility
  {

    struct Static_String
    {
      template<size_t N>
        constexpr Static_String(const char (&str)[N]) noexcept
        : m_size(N-1), data(&str[0])
        {
        }

      constexpr size_t size() const noexcept {
        return m_size;
      }

      constexpr const char *c_str() const noexcept {
        return data;
      }

      constexpr auto begin() const noexcept {
        return data;
      }

      constexpr auto end() const noexcept {
        return data + m_size;
      }

      constexpr bool operator==(std::string_view other) const noexcept {
        //return std::string_view(data, m_size) == other;
        auto b1 = begin();
        const auto e1 = end();
        auto b2 = other.begin();
        const auto e2 = other.end();

        if (e1 - b1 != e2 - b2) { return false; }

        while (b1 != e1) {
          if (*b1 != *b2) { return false; }
          ++b1; ++b2;
        }
        return true;
      }

      bool operator==(const std::string &t_str) const noexcept {
        return std::equal(begin(), end(), std::cbegin(t_str), std::cend(t_str));
      }

      const size_t m_size;
      const char *data = nullptr;
    };
  }
}

#endif